Weber,
When reading about features on a particular grill and your looking to see what the frame is made out of, the hood, side burners.
Example.

Webber Genesis platinum B· Stainless steel frame· Stainless steel hood with a center-mounted thermometer and accent-colored, cast-aluminum end caps· Crackproof all-weather wheels and locking casters· Two accent-colored, thermoset, swing-up work surfaces and two removable accent-colored, thermoset work surfaces, both with stainless steel inserts· Enclosed cart with stainless steel doorsCooking System
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" There="There" are="are" some="some" important="important" features="features" you="you" should="should" be="be" aware="aware" of="of" when="when" making="making" a="a" purchase.="purchase." To="To" properly="properly" broil="broil" a="a" steak="steak" you="you" have="have" to="to" deliver="deliver" a="a" minimum="minimum" of="of" 30M="30M" BTU's.="BTU's." But="But" even="even" with="with" 30M="30M" you="you" will="will" have="have" to="to" close="close" the="the" lid="lid" to="to" the="the" grill="grill" and="and" allow="allow" it="it" to="to" reach="reach" 700="700" degrees="degrees" fairenheit="fairenheit" before="before" placing="placing" the="the" steak="steak" on="on" the="the" grill.